The front su pports are high enough so men can shoot from beneath the overhead cover when it IS completed.

CONSTRUCTING ROOF

WATERPROOFING

The roof is made of logs 4" -6" in diameter placed side by side across the supports.

A water-repellant layer, such as waterproof packing material, plastic membrane, or a poncho, is then laid over the logs.

CAMOUFLAGE OVERHEAD COVER

18"-20" of dirt is added and molded to blend with the slope of the terrain.

C-5

FMS-103------------------------------------------------------------

DISMOUNTED TOW POSITION

I I

.... '" I

- 214" -> 1/

/ <, /'

// -_ OVERHEAD COVER USING

/ // 5'" LDGS 4"-6" IN DIAMETER

5'0" ~ __ \ '..... // / -0 WITH WATERPROOF LAYER

I . . I / ',// AND ABOUT 20" DF SOIl.

1/ /

I I / / PLACE OVERHEAD COVER

I 1/ / ON 80TH SIDES OF WEAPON.

l) /

/ I /

'''-,./ I Ijl 50"

',\ /

" /

'''- ...... _/

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20"

)

C-6

FM 5-103

MACHINE GUN POSITION

DIGGING POSITION

,"~I'

MARKING THE POSITION OF THE TRIPOD LEGS AND THE LIMITS OF THE SECTORS OF FIRE

THE WEAPON IS LOWERED BY DIGGING DOWN FIRING PLATFORMS WHERE THE MG WILL BE PLACED. THE CREW THEN DIGS THE HOLE ABOUT ARMPIT DEEP. DIRT IS PLACED FIRST WHERE FRONTAL COVER IS NEEDED THEN ON KS AND REAR.

GRENADE SUMP LOCATIONS

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o

IN SOME POSITIONS, AN MG MAY NOT HAVE A SECONDARY SECTOR OF FIRE; SO, ONLY HALF OF THE POSITION IS DUG.

TOP VIEW

AMMO BEARER'S POSITION

WHEN THERE IS A THREE-MAN CREW FOR AN MG, THE AMMUNITION BEARER DIGS A ONEMAN FIGHTING POSITION TO THE FLANK.

C-7

FM5-103---------------------------------------------------------

C-8

MORTAR POSITION (81MM AND 4.2-IN MORTARS)

HASTY POSITION

AIMING POSTS 165 AND 300 FT

IN FRONT OF WEAPON

NOTE: FRONT EDGE OF POSITION SLOPED TO CLEAR LINE OF SIGHT TO AIMING POSTS

(1) Abut longer side walls against shorter end walls because the longer walls must sustain the greatest load. The shorter walls then act as a support. Install hinges during assembly.

(2) Provide wall bracing (2" x 6") at the top of the shelter. Brace from the center of each wall to the center of each adjacent wall (diamond pattern).

(3) Attach a sheet of plastic or other thin waterproof covering around the outside before backfilling to minimize friction between earth and the walls and increase moisture reststance.

(4) Make the shelter no larger than necessary. It should be no more than 6-1/2 feet high and the floor area should be less than 100 ft2 unless special effort is made to provide adequate structural members in addition to those specified.

BILL OF MATERIALS (ROOF)

ITEM UNIT QUANTITY

4"x8"x12' 4"x8"x14' 4'x8'x3/4" PLYWOOD

EA EA EA

13 4 6

(5) Backfilling should be accomplished by hand labor, maintaining a uniform load around the perimeter as backfilling progresses.

(6) Make the bottom of the excavation 2 feet longer and 2 feet wider than' the length and width of the structu re floor to increase working room during erection and provide adequate clearance for the walls.

(7) Use explosives as extensively as practical during excavation to minimize required hand digging.

(8) To complete the structure provide a suitable entryway. Drainage ditches should be provided around the shelter to carry away runoff, and a waterproof cover placed over the overhead cover to prevent saturation of the soil material and eliminate seepage into the interior.

(9) Prior to lifting the structure from the installed position, remove some of the backfill with hand tools to reduce effects of wall friction.